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mmm it's silly I know, but since I'm doing the rooting stuff, I need to turn off the device but since the screen is all black I can't press the "turn off device" in the screen,
Is there other way?
not with the 2010 and 2011 Xperias, the only way is to remove the SD card, with the 2012 Xperias you press and hold the power button and volume up for 4 seconds.
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unrelated topic, if you have some time please check this thread
Well, I had to remove the battery. thank you anyway! 
anytime, if you are flashing check this thread
http://talk.sonymobile.com/thread/38251
Don't forget to mark the Correct Answers & Helpful Answers
unrelated topic, if you have some time please check this thread
Yeap, well I'm trying to go by this one: http://talk.sonymobile.com/message/286187#286187
All "ok" with the steps, but the screen is black now...
Edit, I did the final 2 steps again and now is fine 
Excellent